private static string CmdPing(string strIp)
{

  Process p = new Process(); p.StartInfo.FileName = "cmd.exe";//设定程序名
  p.StartInfo.UseShellExecute = false; //关闭Shell的使用
  p.StartInfo.RedirectStandardInput = true;//重定向标准输入
  p.StartInfo.RedirectStandardOutput = true;//重定向标准输出
  p.StartInfo.RedirectStandardError = true;//重定向错误输出
  p.StartInfo.CreateNoWindow = true;//设置不显示窗口
  string pingrst; p.Start(); p.StandardInput.WriteLine("ping " + strIp);
  p.StandardInput.WriteLine("exit");
  string strRst = p.StandardOutput.ReadToEnd();
  
  if (strRst.IndexOf("(0% loss)") != -1)
  {
    pingrst = "连接";
  }
  else if (strRst.IndexOf("Destination host unreachable.") != -1)
  {
    pingrst = "无法到达目的主机";
  }
  else if (strRst.IndexOf("Request timed out.") != -1)
  {
    pingrst = "超时";
  }
  else if (strRst.IndexOf("Unknown host") != -1)
  {
    pingrst = "无法解析主机";
  }
  else
  {
    pingrst = strRst;
  }
  p.Close();
  return pingrst;
}

private void displayReply(PingReply reply) //显示结果
{

  Ping p1 = new Ping(); //只是演示，没有做错误处理
  
  PingReply reply = p1.Send("填写ip地址");
  
  StringBuilder sbuilder ;
  if (reply.Status == IPStatus.Success)
  {
    　　sbuilder = new StringBuilder();
    　　sbuilder.Append(string.Format("Address: {0} ", reply.Address.ToString ()));
    　　sbuilder.Append(string.Format("RoundTrip time: {0} ", reply.RoundtripTime));
    　　sbuilder.Append(string.Format("Time to live: {0} ", reply.Options.Ttl));
    　　sbuilder.Append(string.Format("Don't fragment: {0} ", reply.Options.DontFragment));
    　　sbuilder.Append(string.Format("Buffer size: {0} ", reply.Buffer.Length));
    　　response.write(sbuilder.ToString());
  }
  else if (reply.Status == IPStatus.TimeOut)　　
  {
    response.write("超时");
  }else{
    response.write("失败");
  }